[David Ruiz] decided to build a cutdown version for everyone’s favourite, the ATmega328. Due to the limited resources available, it’s not a direct port of Doom.

The build is based on an ATmega328 and a 1.8″ ST7735R display which has a 128×160 resolution. The MC33204PG operational amplifier is used in conjunction with a potentiometer to scale the input ...